Super Smash Bros. for Wii U
The Legend of Zelda: A Link to the Past
Super Mario RPG: Legend of the Seven Stars
Dark Souls III
Castlevania: Symphony of the Night

Smash Bros - Opened a new world for me, gave me everything I wanted in a game.
ALttP - Introduced me to the Zelda series. Still my overall favorite due to items, dungeons, and challenge.
SMRPG - Introduced me to RPGs. Great script, soundtrack, and battle system.
Dark Souls III - Better than DS1 in every conceivable way. Absolutely love this game and its boss battles and atmosphere.
Castlevania SotN - The definitive Metroidvania, a genre that has changed my life. Love the gothic horror atmosphere and soundtrack.